Yanming Wang, Saad Bhamla and Wei Cai
May, 2012
V ( r i ) = V ( R i ) + 1 2 ∑ i , j U i T ⋅ [ ∂ 2 V ∂ r i ∂ r j ] ⋅ U j {\displaystyle V({r_{i}})=V({R_{i}})+{\frac {1}{2}}\sum _{i,j}U_{i}^{T}\cdot \left[{\frac {\partial ^{2}V}{\partial r_{i}\partial r_{j}}}\right]\cdot U_{j}}
![{\displaystyle V({r_{i}})=V({R_{i}})+{\frac {1}{2}}\sum _{i,j}U_{i}^{T}\cdot \left[{\frac {\partial ^{2}V}{\partial r_{i}\partial r_{j}}}\right]\cdot U_{j}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/d92cb16bec16dedbaa6b3191f642325e26f9ff3e)